On Jan 31, 5:57 am, Cobra007 <mic...@xiac.com> wrote: > You could convert a battery voltage to a nixie voltage relatively easy > with a MAX771 circuit. It will only not give you the maximum > efficiency. What I have done is basically design a circuit (using > multiple ICs) that together function in a similar way as the MAX771, > but slightly different in order to increase the efficiency. So it's a > bit more complicated than just using 1 IC, but I hope it pays off the > effort.
The MAX771 is marked "Not recommended for new designs" (its deprecated) and has been so for several years (maybe 10?). The MAX1771 is its replacement. The 771/1771 are not good at low input voltages - its a topology that would need bootstrapping, which then begs the question: "Why use it in such a specialised design". As size is such a key issue here, I would probably go for something that switched in the MHz range so the inductor is far smaller. The TPS61040/61041 are really nice devices that I've used a few times - http://www.ti.com/product/tps61040 http://www.ti.com/lit/ds/slvs413f/slvs413f.pdf . Have a look at this EDN Design Ideas - "Cascode MOSFET increase boost regulator's input and output voltage ranges" for some ideas... One basic problem with straight boost converters of this topology is that they require a high voltage FET and the physics of such FETs means that they are generally not logic-level driven and mechanically large - other topologies work far better in this application - have a look at "flyback converters" - they use low voltage FETs with low Vgs and which are physically small. Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
